#pragma once

#include <queue>
#include <pthread.h>

const int defaultcap = 5;

template <class T>
class BlockQueue
{
private:
    bool IsFull()
    {
        return _block_queue.size() == _max_cap;
    }

    bool IsEmpty()
    {
        return _block_queue.empty();
    }

public:
    BlockQueue(int max_cap = defaultcap) : _max_cap(max_cap)
    {
        pthread_mutex_init(&_mutex, nullptr);
        pthread_cond_init(&_c_cond, nullptr);
        pthread_cond_init(&_p_cond, nullptr);
    }

    void Pop(T *out)
    {
        pthread_mutex_lock(&_mutex);
        while (IsEmpty())
        {
            pthread_cond_wait(&_c_cond, &_mutex);
        }
        *out = _block_queue.front();
        _block_queue.pop();

        pthread_mutex_unlock(&_mutex);

        pthread_cond_signal(&_p_cond);
    }

    void Equeue(const T &in)
    {
        pthread_mutex_lock(&_mutex);
        while (IsFull())
        {
            pthread_cond_wait(&_p_cond, &_mutex);
        }
        _block_queue.push(in);

        pthread_mutex_unlock(&_mutex);

        pthread_cond_signal(&_c_cond);
    }

    ~BlockQueue()
    {
        pthread_mutex_destroy(&_mutex);
        pthread_cond_destroy(&_c_cond);
        pthread_cond_destroy(&_p_cond);
    }

private:
    std::queue<T> _block_queue;
    int _max_cap;

    pthread_mutex_t _mutex;
    pthread_cond_t _c_cond;
    pthread_cond_t _p_cond;

    // int low_water = _max_cap/3
    // int hight_water _max_cap/3*2
};